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iOS中的Promise
source link: https://juejin.im/post/5cb6d1215188253fdd641c15
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前言 在iOS中我们一般使用delegate(代理)或者block(闭包)来进行异步操作，当要执行多个异步操作，必须将第二个嵌套在第一个的完成内，并且还要正常处理错误。这使得代码结构异常的混乱，不方便查看。 相信码过JS的同学都清楚，在es6中新增promis
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